The PEXP4-RX3 is a right angle riser card for the PCI Express X4 This riser is designed to line up with the top panel cutout of a three cut 2U chassis. bus. The connector is soldered on the component side (B side) of the board. When an I/O board is inserted, the component side of the I/O board will face down, towards the motherboard. The height is 2.82", the connector center height is 2.65", and the width is 2.27".